Automatic telephone-exchange system.



A. E. LUNDELL' AUTOMATIC TELEPHONE EXCHA'NGE SYSTEM. APPLICATlON FILED OCT. 22. 1915.

1,246,125. r PatentedNov. 13,1917.

2 SHEETSSHEET I.

. A. E. LUNDELL.-

AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED OCT. 22, 1915.

Patented Nov'. 13, 1917;

2 SHEETS-SHEET 2- //7 venfar:

8 UNITED TATES E2 1 M ALBEN E. LUNnnLnjoFNEw YORK, in, 'essrenoitjny MESNEASSIGNMENTSQTO :WESTERN ELECTRIC: COMPANY, nconrone'rnn; A 'coRroRA'rIoN or'nnw YORK.

" "AUTOMATIC TELEPHONEEXCHANG'E'SYSTEM; 'y

Toallcvhom z'tmay concern: r V

Be it known that I, ALBEN E.,LUNDELL, a citizen of the United States, residingxat New York; .in the county of Bronx and State of. New York, have in ented-certain new and useful Improvements in Automatic Telephone-Exchange Systems, of Which the following is a full, clear, concise, and eX- act description.

Thisinvention'relates to automatic telephone exchange systems, and 'I'nore particu:

larly 'to' means for controlling the associa tion of an operators telephone setfwith. a

connecting circuit .Inaticdisconnection o f'said telephone set being prevented if theconnecting circuit is ex; tended-t0 another called line, for instance to a l ne eading to a toll or recording o e tOrS posltion. r 1

In the draWings,,Figure' 1" represents din.

grammatically the eircuit arrangement .for establishing connections between calling and groups of called lines; and Fig.' 2 represents an operators controllingarrangement for supervising the establishment of connections;

In the following,,a'jdescription Will be given of the manner 'inewhich a connection is' established betwe'enia calling subseribers station 1 and one group of lin s, such as a .called' subscribers line, and between station land another group out lines, suchfa's a line leading to an operators'position' (for in stance "a toll or recording operators position) at which'a jack 3is provided. i .The subscriber "at station 1, by *remov inghis receiver from the switchhookfiauses" the displaying of a line signal (not shown) .toattract an operators attention, Where-v upon 'this operator extends this line to acounecting circuit 15 'byinserting a plug .4 into j aclr' 5 in which I the',.calling line terminatesq: circuit is closed thereupon from grounded-battery through a'resistance 6, the sleeve contacts of jack 5 and pl gs, and the Windingof a trunk holding relay 7fto, ground. This re ay clgses ;a rcu t otthe desired line; for. instance the line n a Specification of Letters Patent. -Pate11td NOV, 13,1917; i Application i iled October 22,1915. Serial No.

from ground through its armature and front i contact,.conta.ct 8 and the power magnet of "a sequence switch 9 to grounded battery;

Under the control of a normal spring10, sequence switchi) ismoved out of position 1 into position]. It "Will be noted ati.thi s polntl'tha't the sequence switch contacts;

plioneset 20 is connectedwiththe connecting circuit, united with the calling line by means of plug 4 and-jack ,5, through sequence switch contacts 2l"a'ndf22, battery 'spectively-f A S0011 as sequence switch}; I w reachesits positipili, the P O stQIe being supplied to the'line through the' wind} ings of repeating coilj23, 21. V I V I v The operator haying learned the number leading to a substation 2, 'depresses on her keyboard the numerical: designation of this line for adjusting: en mies adapted to" control a train ofgautoniatic sen er switches such as '26, 27 an di28. fOnl wtiifo keysQlS' and' 49 are shown in Fig.v er "the i draw;

ingsh Sendingdevicesjof thistypeareiwell known, .f'and thereforel' the moerat'ionolilthe sending-and controlling arrangementwill 1 notbef'desc ribed in detail], Such descrip tion may befound iarateneue;1,16 ,319 to Y AI f E. Lundell, patented/January 18', 1. 6; Keysf43 ;and49fare prqvided with an" extra set of I contacts 48' and '52, respe'ctivellr' (for purpose to-be hereinafter. set forth; I

Whenfsequence SWltChfQ reached, its posi tionjj'l, 'na"circuit' was closed from ground through the armature "and frontjcontact i of relay 7, sequence switch contact 30,' thej c'on; tactIBlYandl the power magnet of sequence sit/itchflltqfgrouhded battery. .Un der the control of; an normal" spring? 29, sequence switch lliis moved out of position -1 into po: sitiori l' l When the: sequence switch passes through positioni2ifa; circnitlis closed from ground' -f through sequence r switch contacti32,

' cord finder '35 adapted to connect fan; opera relay to grounded batter-3 This. relay becomes energized, and by attracting its righthancl atmaturecloses a driving cir-f 1 v1 eeitgierseqeeeee swine i-thw h SQPWWW 38 for moving this sequence switch out of position 1 into position 2. Relay 37 does not become deenergized when sequence switch 13 leaves its first position, a circuit being closed from grounded battery through the winding of this relay, sequence switch contact 39, the left-hand contact and armature of relay 37, cord finder brush 10, conductor 4:1 and contact l2 of sequence switch 11 to ground.

The desired line belongs to a group, connections to which need not be supervised by the operator. She depresses key 48 for controlling the operation of the selectors.

Supposing that register 14 of the power driven sequence switch type is in position 6, a circuit is closed from ground through contact Q8 of key as, contact 4st and the power magnet oI sequence switch 1+1, whereupon switch 14: is moved under the control of its normal contact 45 out of position 6 into position 1. In this position of register let a circuit is closed from ground through contact d8 of key 18, sequence switch contact l6, contact a? and the power magnet of se quence switch 13 to grounded battery for moving this switch out of position 2 into position 8. A circuit is closed now from ground through sequence switch contact 50, contact 51 and the power magnet of the sender sequence switch 12 to grounded battery, and this switch is moved out of position 1 into position 2.

In position 2 of sequence switch 12 and position 11 of sequence switch 11, the fundamental or controlling circuit is extended to selector switch 26, this circuit being traceable through sequence switch contact 55, conductor 56, cord finder brush 57 the windings of stepping magnet 58, the left-hand contact and armature of a relay 59, sequence switch contact 60, cord finder brush 61, con ductor 62 and sequence switch contact 63. Under the control of revertive impulses sent from selector 26 to the stepping magnet 58, the sender is caused in the well-known man nor to be stepped toward its normal position. After the setting of selector switch 26 in accordance with the first digit designated by sender 2'3, relay 59 becomes energized in the wellknown manner and opens at its lefthand contact the fundamental circuit, causing thereby the arresting of selector 26 on the selected row of terminals whereupon switch 26 will automatically hunt for a free trunk in the selected group. Relay 59 closes also a driving circuit from ground through its right-hand armature and contact, contact 6% and the power magnet of sequence switch 12 to grounded battery for moving this switch out of position 2 into position 1, whereupon relay 59 again becomes deenergized and .re-istablishes the fundamental circuit, which is new extended through the brushes of selector 26 to a trunk leading to another selector 27 Selectors 27 and 28 are controlled in their setting operation in the same manner as was described in connection with selector 26 with the exception that selector 28 is adjusted in accordance with two digits for selecting the line leading to substation 2. After the sending out of each digit, relay 59 is energized and closes the above traced driving circuit for sequence switch 12, whereby after the setting of connector 28, sequence switch 12 will be moved out of its position 8 into position 9. A circuit is closed thereupon from ground through sequence switch contact 65, cord finder brush 66, conductor 67, contact 68 and the power magnet of sequence switch 11 to grounded battery, and this switch is moved out of position 11 into position 16. In position 16 of sequence switch 11 the talking circuit is established through sequence switch contacts 70 and 71, the called substation being signaled in any well-known manner.

ll hen'sequence switch 11 leaves its position 11, contact 42 is opened and therefore relay 37 becomes deenergized and closes a circuit from ground through its right-hand armature and back contact, contact 72 and the power magnet of sequence switch 13 to grounded battery for moving the sequence switch out of position 8 into position 17.

A circuit is now closed from ground through the right-hand armature and back contact of relay 37, sequence switch contacts 73 and 74-, conductor 75, and contact 76 and the power magnet of sequence switch 12 to grounded battery, whereupon sequence switch 12 is driven out of position 9 into its first position. The operatofis sending and controlling apparatus being released to normal, it may be employed now for controlling the establishment of another con nection. I

The establishment of the connection being completed, the operators telephone set 20 is removed from the connecting circuit. A circuitis established from grounded battery through the power magnet and contact 80 of sequence switch 9, conductor 81, the left-hand back contact and armature of a relay 82, conductor 83, sequence switch con tact Si, conductor 75, sequence switch contacts 72 and 73, and the righthand back contact and armatureof relay 37 to ground. Sequence switch 9 is moved out of its listening-in position 7 into the listening-out position 11, and the operators telephone set may thus be connected to other connecting circuits. hen sequence switch 9 is moving toward its 11th position, circuit is closed from ground through sequence switch" contact 85, conductor86, contac 87 and tie winding of relay 82, conductor 88 and se quence switch contact 89 to grounded battery. Relay 82 becomes energized and closes left-hand armature and V v relay 82, conductor" 91; contact- 92 and the a locking circuit for itself throughits-com tact90. I A circuitis now closed for driving sequence switch 13 outof position 17 into its normal position, this-I circuit extending from ground through the right-hand armature and'ba'ck contact ofrelayfl '37, sequence switch contacts 73 and 74, conductor75, se-

quence switch contact 84, conductor 8?;, the

power magnet of sequence switch 13" to grounded battery! When' sequence switch 13is moved "out comes deen'ergized.

f'Should' the operator desire to disconnect 7 her telephone set from the '-connecting -cir- I to listenin again, she depresses a key :94};

cuit'at any stage of the operation, by'de pressing'a master listening-out" key 93, she

may cause sequenceswitch 9 to moveout of position 7 into position 1'1.-f If the operator after her closing thereby a circuit through sequence switch contacts for-sequence switch-r9,' i' causing the movement ;of (this sequence switch out of; position-11 intoposition 1,

from which position fit'will be driven into position 7 due to theclosure ofthe .circ'ult extending fromf'ground through theanna:

ture and front contact of frelay and seer quence switch contactf8i g When the parties 'have finished theirjcom' versation, the operator by pulling out plug ti'from jack- 5 causes the deenergization of relay 7',- whichin turn closes acircu t from ground through "its arr'nature and back conmet, 7 contact 95 and the power magnet; of

"sequence switch 9 to grounded battery; -causing the movement of sequence switch 9 out" (if-position 'llinto-position 1.- The switches 26, 27 "and 28 employed in .the' connection are restored to-normal in thewell known manner. i v Should the calling subscriber-desire to ohi tain a connection to aline i leading to" jack which'is at tolloperato'rs osition; itirzi' s' 3 t necessaryithatthe" connecting operatofis telephone set "remains connected to the selected connecting circuit forTthe purpose of m'aking'possib'le the recording of this' toll ca-ll; The building up of the; connection is accomplished in'the same inanner as-described in the previously supposed .case; now, however,xthe,operator willjhave to depress key 4 9 for causlng the proper setting of selector 26 Selector 26 extends through an idle trunk 100, th'eflfund'amental circuit? through i this trunk and a train of switches (not shown) to jack 3, whereupon a relay 101 is energized due to the closure of a, circuit extending from grounded battery through the winding of this relay, switch contact 70 to ground at repeating coil 23. This relay causes,

front J 5 contact of of'position 17, relay 82 be-:

set has been disconnected desires connection from one line selector 26, sequence" the actuation of a signal 102 which remains operated until the toll operator 1* inserts causing the' energization of relay 103. I

Supposing thatswitch'14 is in position 1 when the operator depresses key 49, a circuit is closed 'from' ground through contact '52- of key 49, sequence switch contact 104: and

the power-magnet of sequence switch 141th her plug v into 1 jack :3,

grounded battery, causing the movement of this sequence switch through position 5 into: position 6, in which position the sequence sw1tch-13 is moved out of position 2 into position 8 in thesamemanner as it was above described, with the this caseth'e circuit spring 105.

only exceptionthat in 7 extends f-fro'm ground through key contact and sequencerswitch As soon as sequence; switch' l3 reaches po-rf 1 sition 4:, a circuit is -closed -from ground. through'sequence switch contacts 106 107 and 108 conductor109, the r-winding ofre lay 82; conductor 88 and sequence switch contact 89 to grounded battery. Relay 82 be-- comes energized'and closes a locking circuitfore, 12 to "Because of o'fits position 17 int-o" position 1 in then-same 82 becomes deenerg'iz'ed.

is claimed is means forremoving said 't'elephone set-trom the circuit upon the c'ompletionot a" conneci the." energization of relay 82, sequence switch 13is moved out "manner 'asjaloove described whereupon relay 1'00 'lrInf "aktelep'honesystem, a plurality-of I lines,- connecting circuits-and switches for interconnecting 's'aid lines; a telephone set," means actuated upon the association ofone; of said connecting I circuits with line for uniting said telephone set ':th"ereto;automatic= means for preventing theoperati'ou of; said iroautomatic means upon the c' m'pletion of a s 2. InYa telephone system, groupsofi lines,

connecting circuits for connectionithereto; V atelephone'set 1 common to sald'connecting circuits, a sequence switch for "each connect ing circuit,- a controllingmagnet for each" switch, means whereby the cont olling-mag;

witch willf lse-operated upon the association of a connecting circuitwith a calling line to connect the telephone 7 7 setf'to said" circuit, automatic "meansfifor again net of the sequences actuating said magnet to remove said set from the circuit uponthe completion of a V 125 for preventing the repeated actuation of said connection to a certain calledline, and means magnet upon the'completion of a connection to another called line.

3. In a telephone-system, a plurality of I v telephone lines, an operators position a connecting circuit for connecting a calling line with a called line or with said position, a telephone set adapted to be united with said circuit, means operable upon the assoeiation of said connecting circuit with a calling line for connecting the telephone set to said circuit, automatic means operable upon the completion of a connection from a calling line to a called line for removing said from said circuit, and means for preventing the operation of said automatic means upon the completion of a connection from a calling line to said operators position.

4c. Ina telephone system, a plurality of lines, connecting circuits, switches for extending a connecting circuit to calling and called lines, a telephone set common to said circuits, a sending device for controlling the operation of certain of said switches, means automatically actuated when a circuit is extended to a calling line for oining the tele-v phone set thereto, automatic means operated when said sending device has reached a predetermined stage in its control of the establishment of a connect on to a certain called line for removing said telephone set from said circuit, and means for preventing the operation of said automatic means it the sending device reaches said predetermined stage in the control of a connection to another called line.

5. In a telephone system, a plurality of telephone lines, connecting circuits, means for connecting said circuits to calling lines, selector switches for extending said circuits to called lines, a telephone set, a switching device operated upon'the' extension of a circuit to a calling line for uniting said telephone set thereto, means for again actuating said device when the connection is extended to a certain called line to remove said set from said connecting circuit, and means for preventing the repeated actuation of said device when the connection is extended to another called line.

6. In a telephone system, a plurality of lines, connecting circuits for association with said lines, a telephone set common to said connecting circuits, electromagnetically operated means individual to each connecting circuit for automatically uniting said telephone set thereto when said circuit is associated with a calling line, a circuit common to said 'electromagnetically operated means, whereby said means will be actuated Copies 01 thispatent may be obtained for five cents each, by addressing the Washington, D. 0.?

to remove said telephone set from a connecting circuit when the connection being established therefrom reaches a predetermined stage, and a relay for interrupting said circuit, whereby it will be rendered ineffective to cause the removal of said set from a connecting circuit when the connection being established therefrom is extended to a certain called line.

7. In a telephone system, a plurality of lines, a connecting circuit, means including selector switches for extending a connecting circuit to calling and called lines, a telephone set adapted to be connected to said circuit upon its extension to a calling line, manual means for controlling the extension of the connecting circuit by means of said switches to a called line, automatic means operative thereupon for removing said telephone set from said circuit, other manual means for controlling said switches to extend said connecting circuit to another called line, and means operative thereupon for preventing the actuation of said automatic means.

8. In a telephone system, a plurality of lines, connecting circuits, means including variably operable selector switches for extending a circuit to calling and called lines, a telephone set, means actuated when a circuit is extended to a calling line for joining the telephone set thereto, automatic means operated when said switches are controlled to select a certain called line and extend a calling line thereto for removing said telephone set from said connecting circuit, and means for preventing the operation of said automatic means if said switches are controlled to select another called line and extend a calling line thereto.

9. In a telephone system, a plurality of lines, connecting circuits and switches for interconnecting said lines, a telephone set, means for uniting said telephone set to a connecting circuit, automatic means for removing said telephone set from the connecting circuit upon the completion of a connection from one line to a certain line, and means for preventing the operation of said automatic means upon the completion of a connection from one line to another line.

In witness whereof, I hereunto subscribe my name this 18th day of October, A. D. 1915.

ALBEN E. LUNDELL.

Commissioner of Yatents 

